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Int. J. Mol. Sci. 2015, 16(7), 15309-15327; doi:10.3390/ijms160715309

β-Radiation Stress Responses on Growth and Antioxidative Defense System in Plants: A Study with Strontium-90 in Lemna minor

1
SCK•CEN, Belgian Nuclear Research Centre, Boeretang 200, 2400 Mol, Belgium
2
Department of Biology, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerpen, Belgium
3
Centre for Environmental Research, University of Hasselt, Universiteitslaan 1, 3590 Diepenbeek, Belgium
4
Veterinary Sciences, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerpen, Belgium
*
Author to whom correspondence should be addressed.
Academic Editor: Ann Cuypers
Received: 28 May 2015 / Revised: 23 June 2015 / Accepted: 26 June 2015 / Published: 7 July 2015
(This article belongs to the Special Issue Abiotic Stress and Gene Networks in Plants)
View Full-Text   |   Download PDF [1121 KB, uploaded 7 July 2015]   |  

Abstract

In the following study, dose dependent effects on growth and oxidative stress induced by β-radiation were examined to gain better insights in the mode of action of β-radiation induced stress in plant species. Radiostrontium (90Sr) was used to test for β-radiation induced responses in the freshwater macrophyte Lemna minor. The accumulation pattern of 90Sr was examined for L. minor root and fronds separately over a seven-day time period and was subsequently used in a dynamic dosimetric model to calculate β-radiation dose rates. Exposing L. minor plants for seven days to a 90Sr activity concentration of 25 up to 25,000 kBq·L−1 resulted in a dose rate between 0.084 ± 0.004 and 97 ± 8 mGy·h−1. After seven days of exposure, root fresh weight showed a dose dependent decrease starting from a dose rate of 9.4 ± 0.5 mGy·h−1. Based on these data, an EDR10 value of 1.5 ± 0.4 mGy·h−1 was estimated for root fresh weight and 52 ± 17 mGy·h1 for frond fresh weight. Different antioxidative enzymes and metabolites were further examined to analyze if β-radiation induces oxidative stress in L. minor. View Full-Text
Keywords: radiation responses; abiotic stress; dosimetry; Lemna minor; oxidative stress; strontium-90 radiation responses; abiotic stress; dosimetry; Lemna minor; oxidative stress; strontium-90
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Van Hoeck, A.; Horemans, N.; Van Hees, M.; Nauts, R.; Knapen, D.; Vandenhove, H.; Blust, R. β-Radiation Stress Responses on Growth and Antioxidative Defense System in Plants: A Study with Strontium-90 in Lemna minor. Int. J. Mol. Sci. 2015, 16, 15309-15327.

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